Document Detail

Fixations on low-resolution images.
MedLine Citation:
PMID:  21518823     Owner:  NLM     Status:  MEDLINE    
When an observer looks at an image, his eyes fixate on a few select points. Fixations from different observers are often consistent-observers tend to look at the same locations. We investigate how image resolution affects fixation locations and consistency across humans through an eye-tracking experiment. We showed 168 natural images and 25 pink noise images at different resolutions to 64 observers. Each image was shown at eight resolutions (height between 4 and 512 pixels) and upsampled to 860 × 1024 pixels for display. The total amount of visual information available ranged from 1/8 to 16 cycles per degree, respectively. We measure how well one observer's fixations predict another observer's fixations on the same image at different resolutions using the area under the receiver operating characteristic (ROC) curves as a metric. We found that: (1) Fixations from lower resolution images can predict fixations on higher resolution images. (2) Human fixations are biased toward the center for all resolutions and this bias is stronger at lower resolutions. (3) Human fixations become more consistent as resolution increases until around 16-64 pixels (1/2 to 2 cycles per degree) after which consistency remains relatively constant despite the spread of fixations away from the center. (4) Fixation consistency depends on image complexity.
Tilke Judd; Fredo Durand; Antonio Torralba
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-04-25
Journal Detail:
Title:  Journal of vision     Volume:  11     ISSN:  1534-7362     ISO Abbreviation:  J Vis     Publication Date:  2011  
Date Detail:
Created Date:  2011-04-26     Completed Date:  2011-08-17     Revised Date:  2013-01-09    
Medline Journal Info:
Nlm Unique ID:  101147197     Medline TA:  J Vis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1-20     Citation Subset:  IM    
CSAIL, Massachusetts Institute of Technology, USA.
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MeSH Terms
Attention / physiology*
Fixation, Ocular / physiology*
Form Perception / physiology*
Middle Aged
Photic Stimulation / methods
ROC Curve
Saccades / physiology*
Young Adult

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